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Moisture Absorption Phenomena in Green Composite Printed Circuit Board Prototypes

Moisture Absorption Phenomena in Green Composite Printed Cir...

引用

Pulsed Power Conference, 2005 IEEE;San Francisco,CA,USA

作者： John D. Lincoln Andrew A. Shapiro Jean-Daniel M. Saphores Oladele A. Ogunseitan Department of Chemical Engineering and Materials Science University of California Irvine CA USA Department of Electrical Engineering and Computer Science University of California Irvine CA USA Departments of Civil and Environmental Engineering Economics and Planning Policy and Design University of California Irvine CA USA Public Health Program College of Health Sciences and the Program in Industrial Ecology Department of Environmental Health Science and Policy University of California Irvine CA USA

ISBN: (纸本)9781424422722

This research developed the moisture-resistance of printed circuit board (PCB) laminate prototypes based on the non-toxic composite materials made from epoxidized linseed oil, melamine polyphosphate, and flax fibers. One of the key issues associated with using renewable base materials in composites is their sensitivity to moisture. A characterization of the properties of the 'green' printed circuit boards developed in the present study showed that moisture absorption for untreated fiber laminates (4.87% vs. established limit <0.8% for FR4 boards over a 24 hour submersion period) compromised electrical resistance and decreased dielectric breakdown to an unacceptable level. A theoretical model was used to target methods for reducing moisture absorption. Based on this model, we found that reductions in fiber diffusivity and fiber volume fraction substantially reduce composite diffusivity. Through the use of chemical treatment, moisture absorption over a 24 hour time period was reduced from 4.87% to 1.15%, which improved electrical properties. At the end of this study, 15 of 18 PCB property requirements were met, while 3 moisture-critical property targets were narrowly missed.

关键词： Printed Circuit Board Design for Environment Green Composite Moisture Absorption Natural Fiber

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Using a literature-based NMF model for discovering gene functional relationships

Using a literature-based NMF model for discovering gene func...

引用

IEEE International Conference on Bioinformatics and Biomedicine Workshops (BIBMW)

作者： Elina Tjioe Michael Berry Ramin Homayouni Genome Science and Technology Graduate School University of Tennessee Knoxville TN USA Department of Electrical Engineering and Computer Science University of Tennessee Knoxville TN USA Bioinformatics Program Department of Biology University of Memphis Memphis TN USA

The rapid growth of the biomedical literature and genomic information presents a major challenge for determining the functional relationships among genes. In this study, we develop a Web-based bioinformatics software environment called FAUN or feature annotation using nonnegative matrix factorization (NMF) to facilitate both the discovery and classification of functional relationships among genes. Both the computational complexity and parameterization of NMF for processing gene sets are discussed. We tested FAUN on three manually constructed gene document collections, and then used it to analyze several microarray-derived gene sets obtained from studies of the developing cerebellum in normal and mutant mice. FAUN provides utilities for collaborative knowledge discovery and identification of new gene relationships from text streams and repositories (e.g., MEDLINE). It is particularly useful for the validation and analysis of gene associations suggested by microarray experimentation.

关键词： Bioinformatics Genomics Data mining Matrix decomposition Large scale integration Feature extraction Iterative methods Biological system modeling computer science Computational biology

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Transactional WaveCache: Towards Speculative and Out-of-Order DataFlow Execution of Memory Operations

Transactional WaveCache: Towards Speculative and Out-of-Orde...

引用

International Symposium on computer Architecture and High Performance Computing (SBAC-PAD)

作者： Leandro A.J. Marzulo Felipe M.G. Franca Vítor Santos Costa Systems Engineering and Computer Science Program COPPE Universidade Federal do Rio de Janeiro Brazil Departmento de Ciência de Computadores Universidade do Porto Porto Portugal

The WaveScalar is the first dataflow architecture that can efficiently provide the sequential memory semantics required by imperative languages. This work presents a speculative memory disambiguation mechanism for this architecture, the transaction WaveCache. Our mechanism maintains the execution order of memory operations within blocks of code, called waves, but adds the ability to speculatively execute, out-of-order, operations from different waves. This mechanism is inspired by progress in supporting transactional memories. Waves are considered as atomic regions and executed as nested transactions. Wave that have finished the execution of all their memory operations are committed, as soon as the previous waves are also committed. If a hazard is detected in a speculative wave, all the following waves (children) are aborted and re-executed. We evaluated the transactional WaveCache on a set of benchmarks from Spec 2000, Mediabench and Mibench (telecomm). Speedups ranging from 1.31 to 2.24 (related to the original WaveScalar) where observed when the benchmark doesn't perform lots of emulated function calls or access memory very often. Low speedups of 1.1 to slowdowns of 0.96 were observed when the opposite happens or when the memory concurrency was high.

关键词： Out of order computer architecture Parallel processing High performance computing Telecommunications Concurrent computing Hardware Data engineering Systems engineering and theory computer science

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Semantic Technologies in System Maintenance (STSM 2008)

Semantic Technologies in System Maintenance (STSM 2008)

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IEEE Workshop on program Comprehension

作者： Juergen Rilling René Witte Dragan Gaševic Jeff Z. Pan Department of Computer Science and Software Engineering Concordia University Montréal Québec Canada University of Karlsruhe Institute for Program Structures and Data Organization (IPD) Karlsruhe Germany Department of Computing Science Aberdeen The University of Aberdeen Scotland UK

This paper gives a brief overview of the international workshop on semantic technologies in system maintenance. It describes a number of semantic technologies (e.g., ontologies, text mining, and knowledge integration techniques) and identifies diverse tasks in software maintenance where the use of semantic technologies can be beneficial, such as traceability, system comprehension, software artifact analysis, and information integration.

关键词： Ontologies Software maintenance Space technology Application software Semantic Web Logic programming computer science OWL Software engineering Information systems

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Ontology Model-Based Static Analysis on Java programs

Ontology Model-Based Static Analysis on Java Programs

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IEEE Annual International computer Software and Applications Conference (COMPSAC)

作者： Lian Yu Jun Zhou Yue Yi Ping Li Qianxiang Wang School of Software and Microelectronics Peking University Beijing China IBM Joint Research National High-Tech Research and Development Program of China School of Electronics Engineering and Computer Science Peking University Beijing China

Typical enterprise and military software systems consist of millions of lines of code with complicated dependence on diverse library abstractions. Manually debugging these codes imposes developers overwhelming workload and difficulties. To address software quality concerns efficiently, this paper proposes an ontology-based static analysis approach to automatically detect bugs in the source code of Java programs. First, we elaborate bug list collected, classify bugs into different categories, and translate bug patterns into SWRL (semantic Web rule language) rules using an ontology tool, Protege. An ontology model of Java program is created according to Java program specification using Protege as well. Both SWRL rules and the program ontology model are exported in OWL (Web ontology language) format. Second, Java source code under analysis is parsed into the abstract syntax tree (AST), which is automatically mapped to the individuals of the program ontology model. SWRL bridge takes in the exported OWL file (representing the SWRL rules model and program ontology model) and the individuals created for the Java code, conduits to Jess (a rule engine), and obtains inference results indicating any bugs. We perform experiments to compare bug detection capability with well-known FindBugs tool. A prototype of bug detector tool is developed to show the validity of the proposed static analysis approach.

关键词： Java OWL computer bugs Ontologies Cognition Bridges Analytical models

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An information theoretic framework for genomic data analysis

An information theoretic framework for genomic data analysis

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IEEE Symposium on Bioinformatics and Bioengineering (BIBE)

作者： Aaron McKenna Gil Alterovitz Bioinformatics Program Boston University Boston MA USA Harvard Partners Center for Genetics and Genomics Harvard Medical School Boston MA Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA Children's Hospital Informatics Program Boston MA

The breadth of biological data collected in the last decade has far outstripped the methods available to process it. To effectively investigate and explore this abundance of data, novel automated collection and analysis approaches must be devised. We have developed a new open software framework, the Open Genomic Analysis Platform (OGAP), to aid in the analysis of genomic data. It is capable of analyzing a variety of data source, and focuses on using information theory to characterize data. The frameworks has is capable of import a variety of genome tied data, and provides custom analysis and visualization of results. We then demonstrate the use of this framework analyzing the Prochlorococcus Marinus organism. We show a strong correlation between the information content of sequence data and up regulation of gene expression during lytic infection.

关键词： Genomics Bioinformatics Data analysis Biological information theory Open source software Information analysis Information theory Data visualization Organisms Gene expression

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Proceedings of the 2008 MidSouth Computational Biology and Bioinformatics Society (MCBIOS) Conference

Proceedings of the 2008 MidSouth Computational Biology and B...

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作者： Wren, Jonathan D. Wilkins, Dawn Fuscoe, James C. Bridges, Susan Winters-Hilt, Stephen Gusev, Yuriy Arthritis and Immunology Research Program Oklahoma Medical Research Foundation 825 N.E. 13th Street Oklahoma City OK 73104-5005 United States Computer and Information Science Department The University of Mississippi University MS 38677 United States Center for Functional Genomics Division of Systems Toxicology National Center for Toxicological Research Jefferson AR 72079 United States Department of Computer Science and Engineering Mississippi State University Box 9637 Mississippi State MS 39762 United States Department of Computer Science University of New Orleans The Research Institute for Children 200 Henry Clay Ave. New Orleans LA 70118 United States Department of Surgery Health Sciences Center The University of Oklahoma Oklahoma City OK 73104 United States

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Monolithic integration of a p-n junction and porous silicon host matrix for next generation photovoltaics

Monolithic integration of a p-n junction and porous silicon ...

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2008 33rd IEEE Photovoltaic Specialists Conference

作者： J.P. Clarkson G. See B. Veeramachaneni L.L. Gadeken K.D. Hirschman P.M. Fauchet BetaBatt Inc. Houston TX USA Microelectronic Engineering Department Rochester Institute of Technology Rochester NY USA Department of Electrical and Computer Engineering University of Rochester Rochester NY USA Materials Science Program University of Rochester Rochester NY USA

We report on a novel three-dimensional Si p-n junction that is capable of performing photovoltaic energy conversion. Vertically aligned pores with a very high aspect ratio of ≫ 100 were formed into a p-type Si substrate through an electrochemical etching process. A conformal p-n junction was then created in the etched porous silicon region by introducing phosphorous dopants through proximity rapid thermal diffusion. Al electrodes were subsequently evaporated on the front and back sides of the diode to establish electrical contact to the n-type and p-type regions respectively. Typical device structures resulted in highly three-dimensional diodes with pores extending up to 100 μm deep into the bulk Si. Porous films this thick correspond to an effective internal surface area of ∼ 5150 cm 2 /cm 3 . This ultimately makes the device applicable to both inorganic and organic next generation photovoltaics where it is desirable to maximize the amount of interfacing surface to a given photoactive compound. Dark box and illuminated I–V measurements of the device demonstrated successful monolithic integration of a p-n diode and a high internal surface area host matrix.

关键词： Monolithic integrated circuits P-n junctions Silicon Photovoltaic cells Diodes Etching Energy conversion Rapid thermal processing Electrodes Contacts

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Elliptical Local Vessel Density: a Fast and Robust Quality Metric for Retinal Images

Elliptical Local Vessel Density: a Fast and Robust Quality M...

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30th Annual International Conference of the IEEE-engineering-in-Medicine-and-Biology-Society

作者： Giancardo, L. Abramoff, M. D. Chaum, E. Karnowski, T. P. Meriaudeau, F. Tobin, K. W., Jr. European VIBOT program United States Department of Ophthalmology and Visual Sciences University of Iowa Hospitals and Clinics Iowa City IA 52242 United States Department of Electrical and Computer Engineering University of Iowa Iowa City IA 55242 United States Retubak Duseases with the University of Tennessee Health Science Center Memphis TN 38163 930 Madison Avenue United States Oak Ridge National Laboratory Oak Ridge TN 37831 United States

ISBN: (纸本)9781424418145

A great effort of the research community is geared towards the creation of an automatic screening system able to promptly detect diabetic retinopathy with the use of fundus cameras. In addition, there are some documented approaches for automatically judging the image quality. We propose a new set of features independent of field of view or resolution to describe the morphology of the patient's vessels. Our initial results suggest that these features can be used to estimate the image quality in a time one order of magnitude shorter than previous techniques.

关键词： Image quality

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DLM: A distributed Large Memory System using remote memory swapping over cluster nodes

DLM: A distributed Large Memory System using remote memory s...

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IEEE International Conference on Cluster Computing

作者： Hiroko Midorikawa Motoyoshi Kurokawa Ryutaro Himeno Mitsuhisa Sato Department of Computer and Information Science Seikei University Musashino Tokyo Japan Graduate School of Systems and Information Engineering University of Tsukuba Tennodai Tsukuba Ibaraki Japan Advanced Center of Computing and Communication Wako Saitama Japan Research Program for Computational Science RIKEN Wako Saitama Japan

Emerging 64 bitOSpsilas supply a huge amount of memory address space that is essential for new applications using very large data. It is expected that the memory in connected nodes can be used to store swapped pages efficiently, especially in a dedicated cluster which has a high-speed network such as 10 GbE and Infiniband. In this paper, we propose the distributed large memory system (DLM), which provides very large virtual memory by using remote memory distributed over the nodes in a cluster. The performance of DLM programs using remote memory is compared to ordinary programs using local memory. The results of STREAM, NPB and Himeno benchmarks show that the DLM achieves better performance than other remote paging schemes using a block swap device to access remote memory. In addition to performance, DLM offers the advantages of easy availability and high portability, because it is a user-level software without the need for special hardware. To obtain high performance, the DLM can tune its parameters independently from kernel swap parameters. We also found that DLMpsilas independence of kernel swapping provides more stable behavior.

关键词： Kernel Arrays Memory management Servers Bandwidth Performance evaluation Benchmark testing

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